Is there any difference between Type S engine and ATR?

usman754 · Post by **usman754** » Mon Apr 23, 2018 8:01 pm

Hi guys,
Like above, is there any difference in those engines? Same Cams etc???
Thank you in advance.
Regards.
Usman

nitin_s1 · Post by **nitin_s1** » Mon Apr 23, 2018 8:11 pm

Everything is the same apart from the blocks (Type-S has special block to accommodate the ATTS) and ATR has a different intake manifold then the Type-S. Those are the things I can remember right now and I’m sure people will come and say other things..

usman754 · Post by **usman754** » Mon Apr 23, 2018 8:38 pm

Thank you Nitin, I am going to pick up cams of ATR to put them into my Prelude. I just wanted to make sure that the cams are same as type S.

nitin_s1 · Post by **nitin_s1** » Mon Apr 23, 2018 10:09 pm

Cams should be the same as the Type-S

Dennis van dijk · Post by **Dennis van dijk** » Mon Apr 23, 2018 10:16 pm

From what i learned there was a little differnce in the cams

hondaddict · Post by **hondaddict** » Tue Apr 24, 2018 5:20 am

Cams are strictly the same , as far as i know ( same part number) .
Pistons and rods are different but the compression ratio is the same

Dennis van dijk · Post by **Dennis van dijk** » Tue Apr 24, 2018 6:57 am

When they have same partnumber then there the same haha

Post by **Merlin** » Tue Apr 24, 2018 11:44 am

nitin_s1 wrote:Everything is the same apart from the blocks (Type-S has special block to accommodate the ATTS) and ATR has a different intake manifold then the Type-S. Those are the things I can remember right now and I’m sure people will come and say other things..

ATR will use a 55mm mains crank whereas the Type-S will use 50 mm (well at least the early ones), Rich at PAW said that he is not sure if the later ones got 55mm crank.

Froidas · Post by **Froidas** » Tue Apr 24, 2018 11:54 am

If we talk about internals, Type S H22A, H22A7 and H22A8 are all the same.
I didn't know about crank mains, though.

The "S" express · Post by **honda-hardy** » Wed Apr 25, 2018 5:17 pm

My type s definitely had 50mm mains. A7 a8 have 55mm